Online Education For Gem Enthusiasts

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The world's best gem articles, published weekly.

Most Recent Articles

Pin Wheel: Online Faceting Designs and Diagrams

Inspired by the classic children’s toy, Jeff Graham’s award-winning Pin Wheel gem design is easy to cut and makes a very interesting stone.

Algodonite Value, Price, and Jewelry Information

Bright, silvery metallic cabochons of algodonite and domeykite are attractive and unusual. Faceted pieces are rarely seen but very beautiful when polished to a high luster.

Bangkok: City of Gemology Schools

Bangkok is the center of the colored gem trade. Compare the top four Bangkok gemology schools and see why this city is the ideal place to learn about gems.

Guide to Diamond Shapes: Price, Size, & More!

Considering different diamond shapes for your engagement ring? Learn how shape affects size and cost and read their pros & cons to see what’s best for you!

Citrine Value, Price, and Jewelry Information

Citrine is the yellow to red-orange variety of crystalline quartz. Clever marketing and the rise of “earth tone” fashions have made this durable and readily available gem a popular jewelry stone in recent years.

Before and After: Pictures of Repaired and Recut Gems

Take a look at these before-and-after pics of repaired and recut gems and learn how a great lapidary can improve the value of many types of gems.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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